| Addison disease |
| Cancer |
| Celiac disease |
| Chronic obstructive pulmonary disease |
| Crohn disease |
| Dementia |
| Depression |
| Diabetes |
| Heart failure |
| HIV/AIDS |
| Hypercalcemia |
| Thyroid disease |
| Parkinson disease |
| Peptic ulcer |
| Tuberculosis |
| Ulcerative colitis |
| Irritable bowel disease |
| Clostridium difficile |
Source: Medscape. How should I evaluate weight loss in the elderly?
